Practicing Primes and Composites

What is the definition of a prime number?

• A whole number that has more than two factors.

• A whole number that has only two factors: one and itself.

• Any even whole number.

• A number that can only be divided by 2.

What is one significant application of prime numbers?

• Calculating the area of geometric shapes.

• Determining the speed of light.

• Used in encryption and codes to hide sensitive data.

• Measuring the temperature of objects.

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Which of the following numbers is a prime number?

• 9

• 15

• 21

• 11

What is the primary purpose of the 'Sieve of Eratosthenes' method?

• To calculate the sum of all numbers up to 100.

• To find all composite numbers within a given range.

• To identify all prime numbers within a given range.

• To determine the largest prime number ever discovered.